/Docs/OTF/org/iaea/GSR3/Footnote/49.md
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Footnote 49
In the case of exposure due to radon, the types of situation that are included in the scope of existing exposure situations will include exposure in workplaces for which the exposure due to radon is not required by or directly related to the work and for which annual average activity concentrations due to 222Rn might be expected not to exceed the reference level established in accordance with para. 5.27.